Expansible packing



Jan. 4, 1927.

E. E. MILLER EXPANSIBLE PACKING Filed June 12. 1925 I Patented Jan. 4,1927.

units era-res- WEE.

E wm E. MILLER, or rminenaon, antiserum.

EXPANSIBLE PACKING.

Application filed June 12, 1925-. Serial He. 36,673.

and so arrangedthat leakage of fluid pres sure used to expand thepacking is effectively prevented between the heads on the plunger.

Another object of the invention is to provide a plunger having anexpansible packing ring. which is so constructedthat it will the plungerroch v i Further objects of the invention are to provide an improvedexpa nsible packing of novel construction and a novel sealing. ring.lVith the foregoing and other objectsin view which will be made manifestin the following detailed description and specifically pointed out inthe appended claims, reference ishad to the accompanying drawings" foran illustrative embodiment of the invention, wherein: t

Figure 1 is a vertical section through a pump cylinder or barrel andthrough the improved form of plunger disposed therein, 9 Fig; 2 is aside elevation of the improved plunger,

F 1g. 3 1s a vert cal sectlon taken on the line 33 of Fig. 2,

Fi 4 isa side elevation of the ex ansible packin I F ig. 5 is an end.elevation, parts being broken away and shown in section, of theexpansible packing, and

Figs, 6' and 7 are a side elevation and an end elevation respectively ofthe sealing ring. earrin to the accompanying drawings wherein similarreferencecharacters designate similar parts throughout, the plunger rodis indicated at 10, having a t Jered portion 11 and an exteriorlythreaded cylindricalpoi'tion 12, although the particular construction ofthe plunger rod is somewhat immaterial. On the plunger rod there aredisposed two heads, indicated at 13 and 1 1, 00 which are maintainedthereon by means of a nut 15' and a lock nut 16. The heads 13 and 1sthave projecting hubs 17 and 18 which abut each other about the plungerrod.

The expansible packing which is preferably formed of soft rubber orequivalent acent its ends.

be maintained in concentric relation about material, is indicated at 19,which has inwardly extending flanges 20 arranged ad 7 On the peripheralsurface of the packing 19 there is formed a groove 21!, and radialaperturesv 22 communicate with the g'i'oove'and with the space betweenthe flanges 20 so as to provide ports whereby fluid pressure may beadmitted to the annular chamber 23 between, the fiangesQO I to expandthe expansible packih'g 19.. The flanges 20 have their inner endstapered to cooperate with the outwardly extending flanges 24 which arealso tapered and which are formed upon the sealing ring. 25 which isarranged about the abutting hubs 17 and 18 so as to prevent leakagebetween the hubs. It will be noted thatthe flanges ZO'and' 24: on theexpansible packingand on the sealing overlap each other and that the ends' upon the bodyfof the sealin'g ringv25.

T e operation of this form of plunger is as follows: Fluid pressureenters through the ports 22 to the space between thepack ing 19 and thesealing ring 25 so as to expand the packing against the interior surfaces of the pump barrel or pump cylinder. The pressure within thechamber 23 urges or inner surfaces of the flanges 2O engage r theflanges 20 against the opposed faces of the heads 13 and 14 and againstthe flanges The flanges 20 and 24 form a tight seal to prevent theescape or leakage of fluid between the abutting hubs 17 and1'8. V

Animportant feature of the invention resides inthe fact that the ends orthe interior surfaces of the flanges 2O abut against the sealing ring25, wh ch constitutes a part of the body of the plunger.- The pumps forwhich" the improved plungers are primarily designed, usually are soarranged that the cylinder or barrel is inhorizontal position.

Consequently. the packing- 19 tends to bear against the bottom of thebarrel, because of its own weight, with a greater force than'thc forcewith which it bears againstthetop of the cylinder. It therefore followsthat the wear on the bottom side of the expansible packing 19 is thegreatest. The flanges '20 hearing against the body of the plunger tendto maintain the packing ring in concentric relation about the plungerrod 10, so that although the plunger is horizontally reciprocated. thewear will be more evenl distributed over all of the peripheral surfaceof the cripansible packing. It will be readily a preciated that inoverlapping the flanges and 24, it is not necessary that the flanges betapered, although this construction is preferably employed.

From the above it will be appreciated that an improved form of plungeris provided, in which the chamber 23 to which the fluid pressure isadmitted is practically surrounded by rubber or equivalent material insuch .a manner that leakage therefrom is practically impossible.

It will be understood that various changes in the detail of constructionmay be made without departing trom the spirit or scope oi the inventionas defined by the appended claims. 7

I claim:

1. A plunger tor pumps and the like comprising a plunger rod, meansproviding heads upon the plunger rod, a sealing ring disposed betweenthe heads, and an esp-ansiblepacking disposedbel'ween the heads aboutthe; sealing ring having apertures therethrough, whereby fluid pressuremay be admitted to the space between the sealing ring and the packing toexpand the packing.

2. A plunger for pumps and the like comprising a plunger rod, meansproviding heads upon the plunger rod, an expansible packing disposedbetween the heads and bearing thereagainst, said packing having inwardlyextending flanges, a sealing ring disposed between the heads havingoutward- 1y extending flanges, the flanges on the packing and on thesealing ring engaging each other, and means for admitting fluid pressure between the packing and the sealing ring to expand the packing.

. 3. A plunger for pumps and the like comprising a plunger rod, meansproviding heads upon the plunger rod, an enpansible packing disposedbetween the heads having inwardly extending flanges, a sealing ringdisposed between the heads having outward ly extending flanges, theflanges on the packing and on the sealing ring being tapered andoverlapping, and means for admitting fluid pressure to the space betweenthe packing and the sealing ring to expand the pack In d. A plunger forpumps and the like com-' mitting fluid pressure to the space between thesealing ring and the packing to expand the packln body having inwardlyextending flanges and having an annular groove formed on its pe-'ripheral surface, there being radial apertures formed in the packingbetween the flanges, said apertures communicating with said groove, theflanges being inwardly tapered as and for the purpose described.

7. A plunger for pumps and the like comprising a plunger rod, a pair ofheads upon the plunger rod having abutting hubs, a 5 aling ring disposedbetween the heads about the abutting hubs preventing leakagetherebetween, said sealing ring having outward- .l' extendin ta )GI'Gdflan es and an ex )an sible packing disposed between the heads havinginwardly extending tapered flanges overlapping the flanges on thesealing ring, and means for admitting fluid pressure to tllQ'SPHCGbetween the packing and the sealing ring.

8. A plunger for pumps and the like comprising a plunger rod, a. pair ofheads upon the plunger rod having abutting hubs, a sealing ring disposedbetween the heads about the abutting hubs preventing leakagetherebetween, said sealing ring having outwardly extending taperedflanges, and an expansible packing disposed between the heads havinginwardly extending tapered flanges overlapping the flanges on thesealing ring, said packing having a groove formed on its peripheralsurface and radial ports communicating therewith, whereby fluid pressuremay be admitted to the space between the packing and sealing ring toexpand the pacle mg.

I 9. A plunger tor pumps and the like comprising a plunger rod, twoheads fitted onto the plunger rod, a sealing ring fitted between theheads having outwardly extending flanges, an expansible packing ringfitting between the heads having inwardly extend ing flanges engageableupon and overlapping the flanges on the sealing ring, and means foradmitting fluid to the space between the packing ring, the sealing ringand their respective flanges.

In testimony whereof I have signed my name to this specification;

ERWIN E. MILLER:

